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How to calculate elapsed time in different time/date zones?

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How to calculate elapsed time in different time/date zones?

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Old Oct 21, 2014, 4:10 am
  #1  
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How to calculate elapsed time in different time/date zones?

How much time is there between:
  • 3 AM (PDT) on Tuesday, September 30, 2014 and 2:20 PM (CET) on Wednesday, October 1, 2014.
  • 3:16 (CET) on Sunday, October 19, 2014 and 4:33 PM (PDT) on Sunday, October 18, 2014
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Old Oct 21, 2014, 4:46 am
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you can work it out using websites such as www.timeanddate.com
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Old Oct 21, 2014, 6:39 am
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  • 3 AM (PDT) on Tuesday, September 30, 2014 and 2:20 PM (CET) on Wednesday, October 1, 2014.

    26 hours and 20 minutes.

  • 3:16 (CET) on Sunday, October 19, 2014 and 4:33 PM (PDT) on Sunday, October 18, 2014

    Please clarify. 3:16 AM or PM - and on which days? October 19 was the Sunday, October 18 was the Saturday.
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Old Oct 21, 2014, 2:02 pm
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Originally Posted by Kiwi Flyer
you can work it out using websites such as www.timeanddate.com
Or simply use the same time zone for both data points (one of the main purposes of GMT). I'm really shocked that there needs to be a thread about this (3rd grade math?) matter.
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Old Oct 21, 2014, 2:24 pm
  #5  
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I'd use UTC.

Although GMT should work as well, I've had cases working with British clients where people confuse it with BST, their local daylight savings time.

UTC should be unambiguous.
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Old Oct 21, 2014, 11:31 pm
  #6  
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That's 3:16 AM (CET) on Sunday, October 19, 2014
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Old Oct 22, 2014, 12:31 am
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Surely this is simple arithmetic? I've just gone by what the relative time GMT and used simple addition.
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Old Oct 22, 2014, 12:51 am
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Originally Posted by CitizenWorld
Surely this is simple arithmetic? I've just gone by what the relative time GMT and used simple addition.
Sometimes even simple addition/subtraction can be challenging to certain people.

Thanks to modern technology, now we have apps/websites/even google to help out.
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Old Oct 22, 2014, 1:46 am
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Originally Posted by lin821
Sometimes even simple addition/subtraction can be challenging to certain people.

Thanks to modern technology, now we have apps/websites/even google to help out.
Am I the only one who thinks this is a problem in this day and age?
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Old Oct 22, 2014, 2:01 am
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Originally Posted by pinniped
UTC should be unambiguous.
I have had my wristwatch set to UTC for the last 10+ years and always note times on paper with a suffix of either Z (for Zulu time/UTC) or L (for Local time).
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Old Oct 22, 2014, 8:18 am
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Originally Posted by CitizenWorld
Am I the only one who thinks this is a problem in this day and age?
No.
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Old Oct 22, 2014, 8:25 am
  #12  
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Originally Posted by lin821
Thanks to modern technology, now we have apps/websites/even google to help out.
I must admit that, for similar reasons, my spelling skills have devolved considerably since I was 17.
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Old Oct 22, 2014, 8:39 am
  #13  
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An added benefit of a decent app could also be taking into account various daylight savings times in different regions.

Europe and the U.S. change clocks on different dates, for example. I'm used to thinking "Central Time to UK is 6 hours, Western Europe is 7." But there are a couple weeks a year where that's not true. (Obviously some parts of the world don't move the clocks at all.)
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Old Oct 22, 2014, 12:17 pm
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"CET" means "Central European Time" (not "Central U.S. time").
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Old Oct 22, 2014, 12:43 pm
  #15  
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Originally Posted by CitizenWorld
Am I the only one who thinks this is a problem in this day and age?
You'd think this is solved by technology, but living in Chicago and having relatives in NW Indiana (which follows no known standard time - and I've accused them of breaking the time/space continuum) the only way I know for sure when to appear for an appointment is to call them that day to confirm which time they're currently on.
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